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  • Could you please refer to the specific example, why do div2 and div3 appear below div1? Commented Mar 13, 2017 at 9:27
  • absolute is the trickiest position value. absolute behaves like fixed except relative to the nearest positioned ancestor instead of relative to the viewport. If an absolutely-positioned element has no positioned ancestors, it uses the document body, and still moves along with page scrolling. Commented Mar 13, 2017 at 9:35